linux-kernel - pl2303_ttyUSB0 userspace application not able to control RTS line

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Message-Id: <20101005104403.M28756@admin-gateway.ncra.tifr.res.in>
Date:	Tue, 5 Oct 2010 16:33:16 +0530
From:	"Raju Rameshwar Uprade" <rajsingh@...a.tifr.res.in>
To:	Greg KH <gregkh@...e.de>
Cc:	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
Subject: pl2303_ttyUSB0 userspace application not able to control RTS line

Hi,
   I am using a prolific tech USB-to-serial converter on linux kernel version 2.6.35.
I wrote a userspace program to enable/disable RTS line which is working fine with
standard serial port like ttyS0 and ttyS1.

But when I used the USB-to-serial port (ttyUSB0) to enable/disable the RTS line,ttyUSB0
is not able to do that as well as some times gives

pl2303_ttyUSB0 : pl2303_open-failed submitting read urb -error 22.

Attached is the userspace application and kernel log is also given below,

/home/teleset/Desktop/USB-Serial/pl2303.c: pl2303_open -  port 0
/home/teleset/Desktop/USB-Serial/pl2303.c: 0x40:0x1:0x8:0x0  0
/home/teleset/Desktop/USB-Serial/pl2303.c: 0x40:0x1:0x9:0x0  0
/home/teleset/Desktop/USB-Serial/pl2303.c: pl2303_set_termios -  port 0
/home/teleset/Desktop/USB-Serial/pl2303.c: 0xa1:0x21:0:0  7 - 80 25 0 0 0 0 8
/home/teleset/Desktop/USB-Serial/pl2303.c: pl2303_set_termios - data bits = 8
/home/teleset/Desktop/USB-Serial/pl2303.c: pl2303_set_termios - baud = 9600
/home/teleset/Desktop/USB-Serial/pl2303.c: pl2303_set_termios - stop bits = 1
/home/teleset/Desktop/USB-Serial/pl2303.c: pl2303_set_termios - parity = none
/home/teleset/Desktop/USB-Serial/pl2303.c: 0x21:0x20:0:0  7
/home/teleset/Desktop/USB-Serial/pl2303.c: 0xa1:0x21:0:0  7 - 80 25 0 0 0 0 8
/home/teleset/Desktop/USB-Serial/pl2303.c: 0x40:0x1:0x0:0x0  0
/home/teleset/Desktop/USB-Serial/pl2303.c: pl2303_open - submitting read urb
/home/teleset/Desktop/USB-Serial/pl2303.c: pl2303_open - submitting interrupt urb
/home/teleset/Desktop/USB-Serial/pl2303.c: pl2303_ioctl (0) cmd = 0x5401
/home/teleset/Desktop/USB-Serial/pl2303.c: pl2303_ioctl not supported = 0x5401
/home/teleset/Desktop/USB-Serial/pl2303.c: pl2303_ioctl (0) cmd = 0x540b
/home/teleset/Desktop/USB-Serial/pl2303.c: pl2303_ioctl not supported = 0x540b
/home/teleset/Desktop/USB-Serial/pl2303.c: pl2303_ioctl (0) cmd = 0x5402
/home/teleset/Desktop/USB-Serial/pl2303.c: pl2303_ioctl not supported = 0x5402
/home/teleset/Desktop/USB-Serial/pl2303.c: pl2303_set_termios -  port 0
/home/teleset/Desktop/USB-Serial/pl2303.c: 0xa1:0x21:0:0  7 - 80 25 0 0 0 0 8
/home/teleset/Desktop/USB-Serial/pl2303.c: pl2303_set_termios - data bits = 8
/home/teleset/Desktop/USB-Serial/pl2303.c: pl2303_set_termios - baud = 9600
/home/teleset/Desktop/USB-Serial/pl2303.c: pl2303_set_termios - stop bits = 1
/home/teleset/Desktop/USB-Serial/pl2303.c: pl2303_set_termios - parity = none
/home/teleset/Desktop/USB-Serial/pl2303.c: 0x21:0x20:0:0  7
/home/teleset/Desktop/USB-Serial/pl2303.c: 0xa1:0x21:0:0  7 - 80 25 0 0 0 0 8
/home/teleset/Desktop/USB-Serial/pl2303.c: 0x40:0x1:0x0:0x61  0
/home/teleset/Desktop/USB-Serial/pl2303.c: pl2303_ioctl (0) cmd = 0x5401
/home/teleset/Desktop/USB-Serial/pl2303.c: pl2303_ioctl not supported = 0x5401
/home/teleset/Desktop/USB-Serial/pl2303.c: pl2303_tiocmget (0)
/home/teleset/Desktop/USB-Serial/pl2303.c: pl2303_tiocmget - result = 6
/home/teleset/Desktop/USB-Serial/pl2303.c: set_control_lines - value = 3, retval = 0
/home/teleset/Desktop/USB-Serial/pl2303.c: pl2303_tiocmget (0)
/home/teleset/Desktop/USB-Serial/pl2303.c: pl2303_tiocmget - result = 6
/home/teleset/Desktop/USB-Serial/pl2303.c: set_control_lines - value = 1, retval = 0
/home/teleset/Desktop/USB-Serial/pl2303.c: pl2303_ioctl (0) cmd = 0x5402
/home/teleset/Desktop/USB-Serial/pl2303.c: pl2303_ioctl not supported = 0x5402
/home/teleset/Desktop/USB-Serial/pl2303.c: pl2303_set_termios -  port 0
/home/teleset/Desktop/USB-Serial/pl2303.c: 0xa1:0x21:0:0  7 - 80 25 0 0 0 0 8
/home/teleset/Desktop/USB-Serial/pl2303.c: pl2303_set_termios - data bits = 8
/home/teleset/Desktop/USB-Serial/pl2303.c: pl2303_set_termios - baud = 9600
/home/teleset/Desktop/USB-Serial/pl2303.c: pl2303_set_termios - stop bits = 1
/home/teleset/Desktop/USB-Serial/pl2303.c: pl2303_set_termios - parity = none
/home/teleset/Desktop/USB-Serial/pl2303.c: 0x21:0x20:0:0  7
/home/teleset/Desktop/USB-Serial/pl2303.c: set_control_lines - value = 3, retval = 0
/home/teleset/Desktop/USB-Serial/pl2303.c: 0xa1:0x21:0:0  7 - 80 25 0 0 0 0 8
/home/teleset/Desktop/USB-Serial/pl2303.c: 0x40:0x1:0x0:0x0  0
/home/teleset/Desktop/USB-Serial/pl2303.c: pl2303_ioctl (0) cmd = 0x5401
/home/teleset/Desktop/USB-Serial/pl2303.c: pl2303_ioctl not supported = 0x5401
/home/teleset/Desktop/USB-Serial/pl2303.c: pl2303_close - port 0
/home/teleset/Desktop/USB-Serial/pl2303.c: pl2303_close - shutting down urbs
/home/teleset/Desktop/USB-Serial/pl2303.c: pl2303_read_bulk_callback - port 0
/home/teleset/Desktop/USB-Serial/pl2303.c: pl2303_read_bulk_callback - urb status = -2
/home/teleset/Desktop/USB-Serial/pl2303.c: pl2303_read_bulk_callback - port is closed,
exiting.
/home/teleset/Desktop/USB-Serial/pl2303.c: pl2303_read_int_callback (0)
/home/teleset/Desktop/USB-Serial/pl2303.c: pl2303_read_int_callback - urb shutting do

Thanks-
Raj

View attachment "Test.c" of type "text/x-csrc" (1632 bytes)